Advances in Wireless Networks: Topology, Signal Structure, and Feedback

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The public’s engagement with applications enabled by wireless communications is transforming the way in which people around the world live their lives; from the mobile banking systems, such as M-PESA, that are transforming developing economies and the enabling of “citizen journalism”, to live coverage of sporting events, video phone calls, and ubiquitous access to information. The increasing popularity of wireless applications, and the emergence of a wide variety of wireless machine-to-machine communication applications (some of which fall under the umbrella of the envisioned Internet of Things) are driving demand for wireless access beyond the capabilities of the current generation of wireless networks. Indeed, the common consensus is that by 2020 wireless networks will be seeking to serve 10-100 times as many devices as current networks, to deliver 1000 times the data traffic, to reduce the latency by a factor of 5, and to reduce the energy consumption (in joules-per-bit) by a factor of 100. It is now widely recognized that incremental enhancements of the current (fourth) generation of networks will not be able to achieve these targets and that the time has come to envision the architectures of a fifth and future generations.